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參數(shù)資料
| 型號(hào)： | MC33364D1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 50mA Switched-Cap DC/DC Converter 8-MSOP |
| 中文描述： | SWITCHING CONTROLLER, 800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOP-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 170K |
| 代理商： | MC33364D1 |
MC33364
http://onsemi.com
11
The MOC8102 has a typical current transfer ratio (CTR)
of 100% with 25% tolerance. When the TL431 is full-on,
5 mA will be drawn from the transistor within the
MOC8102. The transistor should be in saturated state at that
time, so its collector resistor must be
Vref
ILED
Since a resistor of 5.0 k is internally connected from the
reference voltage to the feedback pin of the MC33364, the
external resistor can have a higher value
(Rint)(Rcollector)
(Rint)
Rcollector
Vsat
5.0 V
0.3 V
5.0 mA
940
Rext
R3
(Rcollector)
(5.0 k)(940)
5.0 k
940
1157
1200
This completes the design of the voltage feedback circuit.
In no load condition there is only a current flowing
through the optoisolator diode and the voltage sense divider
on the secondary side.
The load at that condition is given by:
Rnoload
Vout
(ILED
Idiv)
6.0 V
(5.0 mA
0.25 mA)
1143
The output filter pole at no load is:
1
( 2 RnoloadCout)
fpn
1
(2 )(1143)(300 F)
0.46 Hz
In heavy load condition the I
LED
and I
div
is negligible. The
heavy load resistance is given by:
Rheavy
Vout
Iout
6.0 V
2.0 A
3.0
The output filter pole at heavy load of this output is
1
(2 RheavyCout)
fpn
1
(2 )(3)(300 F)
177 Hz
The gain exhibited by the open loop power supply at the
high input voltage will be:
2
Ns
A
Vin max
Vout
(Vin max)(Verror)(Np)
(382 V
(382 V)(1.2 V)(139)
6.0 V)2(7)
15.53
23.82 dB
bandwidth
The
approximately:
fsmin
maximum
recommended
is
fc
5
70 kHz
5
14 kHz
The gain needed by the error amplifier to achieve this
bandwidth is calculated at the rated load because that yields
the bandwidth condition, which is:
Gc
20 log
fc
fph
A
20 log1177
23.82 dB
14.14 dB
The gain in absolute terms is:
Ac
10(Gc 20)
Now the compensation circuit elements can be calculated.
The output resistance of the voltage sense divider is given by
the parallel combination of resistors in the divider:
Rin
10(14.14 20)
51
Rupper|| Rlower
10 k || 14 k
5833
R9
(Ac) (Rin)
29.75 k
30 k
C8
1
2 (Ac) (Rin) (fc)
The compensation zero must be placed at or below the
light load filter pole:
1
11.63 F
382 pF
390 pF
C7
2 (R9) (fpn)
10 F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33364D1G | 功能描述:電流型 PWM 控制器 Variable Frequency SMPS RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33364D1R2 | 功能描述:電流型 PWM 控制器 Variable Frequency RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33364D1R2G | 功能描述:電流型 PWM 控制器 Variable Frequency SMPS RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33364D2 | 功能描述:電流型 PWM 控制器 Variable Frequency RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC33364D2G | 功能描述:電流型 PWM 控制器 Variable Frequency SMPS RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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